CN113799566A

CN113799566A - Adjustable dynamic vibration absorber and teaching method thereof

Info

Publication number: CN113799566A
Application number: CN202111104293.4A
Authority: CN
Inventors: 赵锁强; 余静波
Original assignee: Chery Automobile Co Ltd
Current assignee: Chery Automobile Co Ltd
Priority date: 2021-09-22
Filing date: 2021-09-22
Publication date: 2021-12-17
Anticipated expiration: 2041-09-22
Also published as: CN113799566B

Abstract

The invention provides an adjustable dynamic vibration absorber and a teaching method of the dynamic vibration absorber, which can be used for debugging the vibration absorber during vibration problem vibration isolation in the NVH performance development process of an automobile. The adjustable dynamic vibration absorber comprises a base vibration absorber and a mass block detachably arranged on the base vibration absorber, and the specific tuning method comprises the following steps: A. measuring the system mode of the automobile component to be taught under the boundary condition of the whole automobile; B. selecting a proper mass block to be fixed on the base vibration absorber so that the vibration absorption angular frequency of the adjustable dynamic vibration absorber is equal to the modal frequency of the automobile component to be taught; C. fixing the base vibration absorber on an automobile part to be tuned and taught by utilizing a base and a support, performing experimental optimization on the vibration absorption angular frequency and the mounting position of the adjustable dynamic vibration absorber, and finally determining the vibration absorption angular frequency and the mounting position of the adjustable dynamic vibration absorber to obtain the parameters of the final engineering vibration absorber; D. and (4) detaching the adjustable dynamic vibration absorber for subsequent teaching.

Description

Adjustable dynamic vibration absorber and teaching method thereof

Technical Field

The invention belongs to the field of automobile NVH testing, and particularly relates to a vibration absorber mounted on a front suspension frame in the whole automobile road noise adjusting process.

Background

The development of the road noise is taken as a difficulty, the road noise is mainly overcome by each large host factory in the development of the entire vehicle NVH, various resources are not always concentrated, a large amount of time and cost are spent, the most advanced means are applied, and the like, but the effect is poor, and the fundamental reason is not only that the number of related parts and systems is large and the integration level is complex, but also that the frequency cannot be completely avoided by the inherent structural mode. For example, as the macpherson front suspension is the most commonly used suspension, the influence of the system mode on road noise is large, and the parts are generally coupled, so that the problem cannot be solved thoroughly through frequency avoidance, and only a scheme of adding a dynamic vibration absorber is adopted. In the tuning and teaching process, because the hard points of all vehicle types are different, the system mode is generally between 150-180Hz (flexible mode), the vibration absorber process needs to be repeatedly tuned and a tuning piece is manufactured, then the optimal parameters are determined through tests, the process not only needs the supplier of the vibration absorber to actively cooperate and tune, but also has long period, high cost and unsatisfactory effect.

Disclosure of Invention

The invention aims to provide an adjustable dynamic vibration absorber and a tuning method of the dynamic vibration absorber, which can be used for debugging the vibration absorber during vibration problem vibration isolation in the NVH performance development process of an automobile, thereby accelerating the development progress and saving the development cost.

The adjustable dynamic vibration absorber of the invention is composed of a base vibration absorber and a mass block detachably mounted on the base vibration absorber.

Specifically, the base vibration absorber comprises a central mounting pipe and a sleeve pipe at the outer edge, and the mounting pipe is connected with the sleeve pipe through a plurality of radially distributed rubber blocks; the mass block is composed of two or more split blocks, the split blocks surround the outer edge of the sleeve, the inner edge face of each split block is matched with the outer edge face of the sleeve, and two ends of each split block are connected with the adjacent split blocks through fastening bolts.

The tuning method of the adjustable dynamic vibration absorber comprises the following steps:

A. testing the system mode of the automobile component to be trained under the boundary condition of the whole automobile to obtain the mode frequency of the automobile component to be trained;

B. selecting a proper mass block to be fixed on the base vibration absorber so that the vibration absorption angular frequency of the adjustable dynamic vibration absorber is equal to the modal frequency of the automobile component to be taught; or fixing the mass block on the base vibration absorber, and adjusting the relative angle between the mass block and the base vibration absorber so that the vibration absorption angular frequency of the adjustable dynamic vibration absorber is equal to the modal frequency of the automobile part to be taught;

C. fixing the base vibration absorber on an automobile part to be tuned and taught by utilizing a base and a support, performing experimental optimization on the vibration absorption angular frequency and the mounting position of the adjustable dynamic vibration absorber, and finally determining the vibration absorption angular frequency and the mounting position of the adjustable dynamic vibration absorber to obtain the parameters of the final engineering vibration absorber;

D. and (4) detaching the adjustable dynamic vibration absorber for subsequent teaching.

Furthermore, in order to conveniently adjust the mass of the mass block, the mass block is provided with a plurality of mass blocks, and the mass of different mass blocks is different or different mass blocks can be connected and fixed.

Furthermore, in order to conveniently adjust the mass distribution of the mass blocks, at least one of the split blocks is provided with an internal thread through hole, and the internal thread through hole is provided with an adjusting bolt. The mass distribution of the mass block can be changed by changing the screwing depth of the adjusting bolt or replacing the adjusting bolt with different mass.

Furthermore, the split blocks are composed of arc-shaped strips and convex blocks located at two ends of the arc-shaped strips, through holes are formed in the convex blocks, and adjacent arc-shaped blocks are fixedly connected through bolts penetrating through the through holes. The split block is composed of the arc-shaped strip in the middle and the convex blocks at two ends, so that the mass distribution is not uniform, and the vibration absorption angular frequency of the adjustable dynamic vibration absorber can be changed by utilizing the sine and cosine component of the rubber rigidity of the base vibration absorber in a certain direction by adjusting the relative angle between the mass block and the base vibration absorber.

Furthermore, the adjustable dynamic vibration absorber also comprises a base and a bracket, wherein the base is composed of two arc-shaped blocks which are symmetrically arranged, convex parts are arranged on two sides of each arc-shaped block, each convex part is provided with a through hole, and the two arc-shaped blocks are fixedly connected by fastening bolts penetrating through the through holes; the support comprises a fixed rod and two clamping arms connected to one end of the fixed rod, the clamping arms are provided with through holes, and the base vibration absorber is clamped between the two clamping arms and is fixedly connected with the clamping arms by fastening bolts penetrating through the clamping arm through holes and the base vibration absorber installation pipe.

The adjustable dynamic vibration absorber has the advantages of wide frequency adjusting range, flexible and changeable adjusting mode, repeated use and the like, can make up for the inherent defect of the fixed frequency dynamic vibration absorber, and is very suitable for adjusting the modal frequency of components such as an automobile suspension and the like.

Drawings

Fig. 1 is a schematic structural view of the base vibration absorber of example 1.

Fig. 2 is a schematic structural view of the mass of embodiment 1.

Fig. 3 is a schematic structural view of a base according to embodiment 1.

FIG. 4 is a schematic structural view of the stent of example 1.

Fig. 5 is a schematic view of the entire structure of the adjustable dynamic vibration absorber of embodiment 1.

The figures are numbered: 1. a base; 11. an arc-shaped block; 12. a second through hole; 13. a screw hole; 14. fastening a bolt; 2. a support; 21. fixing the rod; 22. clamping arms; 23. a through hole; 24. a third through hole; 3. a base vibration absorber; 31. installing a pipe; 32. a sleeve; 33. a rubber block; 4. a mass block; 41. splitting the blocks; 42. a first through hole; 43. a first bolt; 44. an internally threaded through bore; 45. adjusting the bolt; 5. a second bolt; 6. and a third bolt.

Detailed Description

The following describes embodiments of the present invention, such as shapes and structures of respective members, mutual positions and connection relationships between respective portions, and actions and operation principles of the respective portions, in further detail, with reference to the accompanying drawings.

Example 1:

the embodiment provides an adjustable dynamic vibration absorber and a training method thereof, which can be used for debugging the vibration absorber in the development process, thereby accelerating the development progress and saving the development cost.

As shown in fig. 1 to 5, the adjustable dynamic vibration absorber of the present embodiment is composed of a base 1, a bracket 2, a base vibration absorber 3, and a mass 4 detachably attached to the base vibration absorber 3. The base 1 and the bracket 2 are both made of aluminum alloy materials.

Specifically, the base vibration absorber 3 comprises a central steel mounting pipe 31 and an outer steel casing pipe 32, wherein the mounting pipe 31 and the casing pipe 32 are connected by a plurality of radially distributed rubber blocks 33; the mass block 4 is composed of two or more steel split blocks 41, each split block 41 is composed of an arc-shaped strip and protruding blocks located at two ends of the arc-shaped strip, each protruding block is provided with a first through hole 42, adjacent arc-shaped blocks are fixedly connected through a first bolt 43 penetrating through the first through hole 42, the split blocks 41 surround the outer edge of the sleeve 32, and the inner edge surface of each split block 41 is matched with the outer edge surface of the sleeve 32.

One of the split blocks 41 is provided with an internally threaded through hole 44, and the internally threaded through hole 44 is fitted with an adjusting bolt 45. The mass distribution of the mass block 4 can be changed by changing the screwing depth of the adjusting bolts 45 or replacing the adjusting bolts 45 of different masses.

The base 1 is composed of two arc blocks 11 which are symmetrically arranged, convex parts are arranged on two sides of each arc block 11, each convex part is provided with a second through hole 12, a screw hole 13 is arranged in the center of each arc block 11, and a fastening bolt 14 can penetrate through each screw hole 13 for fixing the base 1; the bracket 2 is composed of a fixed rod 21 and two parallel clamping arms 22 connected to one end of the fixed rod 21, the clamping arms 22 are provided with through holes 23, and the base vibration absorber 3 is clamped between the two clamping arms 22 and is fixedly connected with the clamping arms 22 by fastening bolts penetrating through the through holes 23 and a mounting pipe 31 of the base vibration absorber 3. The fixing rod 21 is provided with a third through hole 24, one end of each of the two arc-shaped blocks 11 of the base 1 is fixedly connected with the second bolt 5 penetrating through the second through hole 12, and the other end of each of the two arc-shaped blocks is fixedly connected with the fixing rod 21 through a third bolt 6 penetrating through the second through hole 12 and the third through hole 24, so that the support 2 and the base 1 are fixed together.

The tuning method of the adjustable dynamic vibration absorber of the embodiment comprises the following steps:

A. testing the system mode of the front suspension of the automobile to be tuned and taught under the boundary condition of the whole automobile to obtain the mode frequency of the front suspension of the automobile to be tuned and taught; this modality is mainly referred to as the chamber modality. The front suspension system mode mainly comprises a mode of a system consisting of a shock absorber, a spring, a Top _ Mount, a steering knuckle, a hub bearing, a brake disc and a tire rim under the condition of a whole vehicle;

B. frequency modulation of the adjustable dynamic vibration absorber: according to the vibration characteristics, frequency, of a single degree of freedom system

And the vibration absorption angular frequency Fd of the vibration absorber and the front suspension modal frequency Fs are subjected to frequency modulation, and Fd = Fs can be adjusted in two modes, namely the vibration absorption angular frequency of the vibration absorber is equal to the front suspension modal frequency. The first mode is as follows: the basic vibration absorber 3 is fixed, namely k in the formula is kept unchanged, a method of adding mass m to the basic vibration absorber 3 is adopted, the mass block 4 to be added can be calculated by calculating the difference value between Fd and Fs, and then the mass block is superposed and fastened on the vibration absorber, so that the vibration absorption angular frequency of the adjustable dynamic vibration absorber is equal to the modal frequency of the front suspension of the automobile to be taught; the second mode is as follows: the split block 41 is composed of an arc-shaped strip in the middle and convex blocks at two ends, so that the mass distribution is not uniform, and the vibration absorption angular frequency of the adjustable dynamic vibration absorber can be changed by adjusting the relative angle between the mass block 4 and the base vibration absorber 3 and utilizing the sine and cosine component of the rubber rigidity of the base vibration absorber 3 in a certain direction, so that the vibration absorption angular frequency of the adjustable dynamic vibration absorber is equal to the modal frequency of the front suspension of the automobile to be taught; the two modes can be used alternatively or in combination, and are not described again;

C. fixing a base vibration absorber 3 at the central position of a vibration absorber cylinder of a front suspension of an automobile to be tuned and taught by using a base 1 and a support 2, performing experimental optimization on the vibration absorption angular frequency and the mounting position of the adjustable dynamic vibration absorber by using an orthogonal test method, and finally determining the vibration absorption angular frequency and the mounting position of the adjustable dynamic vibration absorber to obtain the parameters and the mounting position of the final engineering vibration absorber;

The invention has been described in connection with the accompanying drawings, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of the components set forth in the following description, as long as the invention is capable of being practiced without modification in any way whatsoever, and is capable of other applications without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. An adjustable dynamic vibration absorber, characterized in that the adjustable dynamic vibration absorber is composed of a base vibration absorber and a mass block detachably mounted on the base vibration absorber.

2. The adjustable dynamic vibration absorber of claim 1 wherein said base vibration absorber comprises a central mounting tube and an outer skirt bushing, the mounting tube and bushing being connected by a plurality of radially disposed rubber blocks; the mass block is composed of two or more split blocks, the split blocks surround the outer edge of the sleeve, the inner edge face of each split block is matched with the outer edge face of the sleeve, and two ends of each split block are connected with the adjacent split blocks through fastening bolts.

3. The adjustable dynamic vibration absorber of claim 2 wherein there are a plurality of said masses, different masses being of different masses, or different masses being connectively fixed.

4. The adjustable dynamic vibration absorber of claim 2 wherein at least one of said individual blocks is provided with an internally threaded through hole, said internally threaded through hole being fitted with an adjustment bolt.

5. The adjustable dynamic vibration absorber of claim 2 wherein said split mass is comprised of arcuate strips and projections at opposite ends of the arcuate strips, said projections having through holes, adjacent arcuate strips being fixedly connected by bolts passing through the through holes.

6. The adjustable dynamic vibration absorber according to claim 1, 2, 3, 4 or 5, further comprising a base and a bracket, wherein the base is composed of two symmetrically arranged arc-shaped blocks, two sides of the arc-shaped blocks are provided with convex portions, the convex portions are provided with through holes, the two arc-shaped blocks are fixedly connected by fastening bolts passing through the through holes, and the centers of the arc-shaped blocks are provided with screw holes; the support comprises a fixed rod and two clamping arms connected to one end of the fixed rod, the clamping arms are provided with through holes, and the base vibration absorber is clamped between the two clamping arms and is fixedly connected with the clamping arms by fastening bolts penetrating through the clamping arm through holes and the base vibration absorber installation pipe.

7. The method for tuning an adjustable dynamic vibration absorber of claim 6, comprising the steps of:

C. fixing the base vibration absorber on an automobile part to be taught by utilizing a base and a support, carrying out experimental optimization on the vibration absorption angular frequency and the mounting position of the adjustable dynamic vibration absorber, finally determining the vibration absorption angular frequency and the mounting position of the adjustable dynamic vibration absorber, and determining the parameters of the final engineering dynamic vibration absorber;